The 0.675" Geotech Portable Bladder Pump is the smallest diameter in the range — built for 3/4" wells, direct-push points, piezometers and multilevel systems where nothing larger will pass. Stainless steel body with a quick-change bladder.

Even at this diameter the pump keeps drive air fully separated from the sample: compressed air squeezes a flexible bladder, and only the bladder touches the water. That is what makes bladder pumps the reference method for low-flow (micro-purge) sampling — no stripping of volatiles, minimal turbidity.

Choosing your configuration

• Standard or drop tube. A drop tube intake draws from below the pump, letting you sample near the base of a short screened interval without moving the pump body.
• Standard or PFAS-free. PFAS-free units use documented fluoropolymer-free wetted materials for programs where PFAS is an analyte. Same price as standard.

Building a complete 0.675" system

A working setup needs four things beyond the pump:

1. GeoControl Pro controller — drives the pump and sets the cycle timing
2. 0.675" bladders — PTFE or polyethylene; replaced between wells
3. 0.675" & 0.85" bonded tubing — air and discharge in one bonded run
4. GeoReel — the hand reel covers both 0.675" and 0.85" pumps

Everything compatible with this diameter is gathered in the 0.675" Bladder Pump System collection.

Specifications | Installation & Operation Manual